The postoffice connector performs the delivery of emails to mailboxes. It is responsible for executing postoffice and mailbox filters, delivery events, auto responders and quota handling. It is possible to determine whether the user is notified of the quota issue and whether the message is returned to the sender or sent to the postmaster for that post office. MailEnable can configure what notifications are sent when a quota is reached, such options such as, Notify Sender only, notify sender and mailbox and send no notifications. Non Delivery Receipts can be configured options such as not sending NDRs or allowing the SMTP service to handle and send all default Non Delivery Receipts. Using the Administration Console you can access the Post Office Connector properties by expanding the Servers > localhost > Services and Connectors branch. Right click on the Postoffice icon and select Properties.